Enbridge Energy Partners, L.P., referred to herein as the Partnership, issued a press release on January 4, 2013,
announcing further expansion of the Lakehead System between Neche, North Dakota, and Superior, Wisconsin. The expansion will add an additional 230,000 barrels per day of capacity at an estimated cost of approximately $0.2 billion, and involves
increased pumping horsepower, with no line pipe construction. This expansion will be jointly funded with Enbridge Inc., or Enbridge, the ultimate parent of the general partner of the Partnership, and the Partnership under a previously disclosed
Mainline Expansion Joint Funding Arrangement under which Enbridge will fund 60 percent of the cost and the Partnership will fund 40 percent, with options granted to the Partnership to decrease its economic interest in the expansion project by up to
15 percent and to increase its economic interest by up to 15 percent. Subject to regulatory approvals, the additional expansion is expected to be available for service in 2015.

The foregoing discussion is qualified in its entirety by reference to the press release dated January 4, 2013, which is attached
hereto as Exhibit 99.1.

Item 9.01. Financial Statements and Exhibits.

(d)

Exhibits.

Reference is made to
the Index of Exhibits following the signature page, which is hereby incorporated into this Item.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

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